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CVE-2026-58592

Ladybird contains a dangling-reference memory-safety flaw in its WebAssembly ESM-integration module loader. When a JavaScript function is imported into a WebAssembly module via the ESM path, WebAssemblyModule.cpp passes a stack-local Wasm::FunctionType by reference to create_host_function, whose host callback captures and later reads that reference; once the ESM link-loop iteration ends the FunctionType is destroyed, leaving the callback with a dangling reference (the normal instantiate path use
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:00a29f45781205635da36a4d556550a42dd0b9598516be0beee9369a2213ec2f
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/metrics/1/cvssV4_0
cwe · 3 assertions

{"cweId":"CWE-825","description":"Expired Pointer Dereference","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-787","description":"Out-of-bounds Write","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/2

{"cweId":"CWE-843","description":"Access of Resource Using Incompatible Type (Type Confusion)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion
{"defaultStatus":"affected","product":"Ladybird","vendor":"LadybirdBrowser","versions":[{"status":"affected","version":"0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.9,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/metrics/1/cvssV4_0

CWE assertions

3 source assertions
{"cweId":"CWE-825","description":"Expired Pointer Dereference","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-787","description":"Out-of-bounds Write","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/2
{"cweId":"CWE-843","description":"Access of Resource Using Incompatible Type (Type Confusion)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/problemTypes/0/descriptions/1

Source references

3 source assertions
{"name":"Affected source","tags":["product"],"url":"https://github.com/LadybirdBrowser/ladybird/blob/master/Libraries/LibWeb/WebAssembly/WebAssemblyModule.cpp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/references/1
{"name":"Proof of Concept","tags":["exploit"],"url":"https://github.com/bikini/exploitarium/tree/main/ladybird-wasm-esm-host-function-rce-poc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/references/0
{"name":"VulnCheck Advisory: Ladybird - Web-Reachable Code Execution via Dangling FunctionType Reference in WebAssembly ESM Integration","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/ladybird-web-reachable-code-execution-via-dangling-functiontype-reference-in-webassembly-esm-integration"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7ea2eec5345b432b81a295709a96f521d1f401e6de4e16849e2f151c73b67d69 · sha256:174980054fc85386… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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